Electrolytic receiver.



No. 875,105. PATENTED DEC. 31, 1907..

F. 0. PIGKETT.*

ELECTROLYTIC RECEIVER.

APPLIG ATION FILED MAR-12', 1907.

Q In use:

' X i v m UNITED snares PATENT OFFICE.

FRED PICKETT, OF KANSAS CITY, MISSOURI.

ELECTROLYTIC RECEIVER.

Specification of Letters Patent.

Patented Dec. 31, 1907;

Application filed March 12. 1907. Serial No. 362,060.

. art commonly known as wireless telegraphy.

The particular invention hereinafter described relates, especially toimprovements in current-actuated wave responsive devices generallyutilized in space telegraphy for collecting electro-radiant energy andtrans formin it into audible signals.

In t e drawings forming a art of this specification':Figure 1 is aongitudinal sectional view through-my improved rece ving oint, a portionof the conductor carrym'g t e point being shown in elevation.

Fig.2 is a greatly enlarged vertical elevation of the point. Inconstructing my point I employ any insoluble metal which also possessesthe propertiesof malleability, and ductility, and which also possessesapproximately the same temperature co-efliciency of expansion as glass.Platinum and gold are examples of such a metal. In my receiver thismetal takes the form of a wire A, one end of which is firmly embeddedand fixed into theend portion of a suitable electrical conductor B, towhich it may be soldered or cemented, This wire is flattened at itsother end as shown at A and is inclosed by an envelo or sleeve C of anysuitable viscid materia usually glass. I have found, however, by

experiments that this envelop C may be formed of a number of substanceswhich will answer the purpose equally as well as glass as, for example,a combination of bees-wax and rosin, seal ing-wax and many other gums.

In'sele'cting thematerial for such an envelop on; is necessary thatmaterial be selected which is tough and not too brittle. In forming thepoint A I prefer to flatten the end of the wire A as this presents athinner a ver weak feathered edge alon ,;the

[area of conducting surface to the electrolyte, but when the point issimply flattened it becomes necessary to form the envelop G into theedgeof attened end portion of t e wire. A

"microscopic examination of such a flattened I point after-it had beenused a short time,

shows that a minute ragged edge had been formed both along the featherededge of the envelop and also upon the flattened portion of the wire,showing that the gas evolution had been sufiicient to seriously affectthe sensitiveness of the point. these flattened edges, both of the ointand the envelop, I split the point A lbngitudinally as shown at A andalso cut the point away centrally as shown at A -the split A extendingfrom the end of the point to the vsaid cut-out portion and Ithen permitthe v and by strengthening both the point and the feathered edge of theenvelop overcomes the objection or disadvantages above noted. Thisbridge therefore, greatly increases the life of the point while thesplitting of the point greatly increases the sensitiveness of therecelving point.

To strengthen It will be especially noted from the enlarged view in Fig.2 that the point is not divided upon its longitudinal center line but onthe other hand is split into two points one of which is of less widththan the other, thereby providing upon the one receiver a fine and acomparatively coarse point. It will be well understood that in order topick up or receive a feeble Wave, a very small point is required. Butthis at the same time produces comparatively only a very faint sound inthe receiver and is also liable at an time to be aifected by staticdisturbances to such an extent that it will be impossible to decipherany signals received from it.'

Upon experiments I have found that a comparatively coarse point couldmany times be made operative by having a buzzer arranged close at handto start the original vibrations and a weak or feeble wave would bereceived for a few seconds and then die out. I also found that byarranging a very small thin oint adjacent to the larger one that the feele wave would be able-to record itself, on the fine point and thus startor set up vibrations in a larger point thereby pro ducing a far moreaudible signal than could be obtained from the fine oint alone and whichcould not be obtaine with the same strength of wave by the larger pointalone.

Therefore, in constructing my point, I split the flattened end A of thew1re so as to form a smaller and a'larger point. A point of thisdescription has not only the advantages of being much more durable thana single flatthe two combined. It also possesses the other.

property of being constantly receptive in the true sense of theword,.being able to receive and transmit in the form of anaudible signalboth weak and strong wave vibrations. Thisduplex point-also possessesdistinct advantages for the following reasons I find upon experimentsthat a single point is often reached by a wave at such a time during aninterval in the evolution of a gas bubble that the point is practicallyinoperative. Thepoints shown and described by me are formed of une ualareas ancl'therefore gently evolves as ubbles at different periods, thatis, whlle the condition of one point may be ready for-producing itsmaximum effect for indication in receiver, the oint is developing thiscondition.

' This will make it obvious why the duplex point is at all times in areceptive condition.

Having thus fully described my invention, what I claim as new and'desireto secure by Letters Patent, is p 1. A receiving oint of the kinddescribed having a flattene end portion, said flattened portion beingsplit and an envelop of viscid material inclos' bridge by extending intothe s lit rtion.

2. A duplex point of the Eind i lescribed consisting of a ieceof wire haan end flattened and sp it longitudinally thus forming two points,and-an envleop inclodng said point and extendi into the split portionand form' a bond etween the two points.

3. A recelver of the kind described cofisisting of a wire having aflattened end rtion, sa1d flattened end portion being sp 't into two Ioints of unequal surface area and an enve opinclosing .said points andextending into the split portion. r 4. A device of the kind describedcomprising a piece of wire having an end portion flattened into a thinsheet, and split longitudi-.

nally upon one side of its longitudinal center forming a smaller andlarger envelop of viscid material inc osing both of the points soformed.

5. A device of the kind des'cribed'consisting of a wire having flattenedthin portion, sa1d portion being centrally cut-out, and the saidflattened portions being split longitu-- dinally into two points ofunequal'surface area, the s lit'extendin'g from edge of the points to te cut-out portion, and an envelop inclosing said flattened portion, andextending into the cut-out portion and into the space between the twopoints, formed by splitting the flattened portion, as and for thepurpose set forth.

- FRED OLARKSON PICKETT.

Witnesses:

v Jnssn .C. PIOKETT,

I. E. Gomma.

said point and forming a:

int, and an

